Plot a sampling as a chessboard

Plots a sampling as a chessboard of dimensions t x q, with t, the number of transects, and q, the number of quadrats.

gg_chessboard(nodes, xlab = "Transect", ylab = "Quadrat")

Arguments

nodes

a data.frame with (at least) the following three columns: node, transect, and quadrats. Must be the output if the function create_node_labels().

xlab

a character of length 1. The title of the top axis. Default is 'Transect'.

ylab

a character of length 1. The title of the left axis. Default is 'Quadrat'.

Value

A ggplot2 object.

Examples

library("chessboard")

# Two-dimensional sampling ----
sites_infos <- expand.grid("transect" = 1:3, "quadrat" = 1:5)

nodes <- create_node_labels(data     = sites_infos, 
                            transect = "transect", 
                            quadrat  = "quadrat")

gg_chessboard(nodes)


# One-dimensional sampling (only transects) ----
sites_infos <- data.frame("transect" = 1:5)

nodes <- create_node_labels(data     = sites_infos, 
                            transect = "transect")

gg_chessboard(nodes)


# One-dimensional sampling (only quadrats) ----
sites_infos <- data.frame("quadrat" = 1:5)

nodes <- create_node_labels(data    = sites_infos, 
                            quadrat = "quadrat")

gg_chessboard(nodes)